I had a similar story, my goal was to let the menu to the end so I could focus on getting the other things to achieve 100% first, but then when I first entered Act 2 I got it
Ok so my first ever experience ended to be in 3am such a horrible experience for me...I swear to gosh..So the way I've been able to get it was by not being persistent on Act 2 u have to be looking through images, mainly Files then go into the game and once I hear creepy music U got the Ending of Ghost Menu
I feel rlly bad for you ppl. I had just finished watching a video on all the DDLC secrets and rare things and decided to see if I could get it and got it on the first go 😅
I've been doing this for a while now, then I check out this video on my phone while keep doing it on my laptop... I skip the video to the end and at the same time I finally got the menuuu, man I thought it would also took me an hour to get it.... Thx for your video I got better luck at this, I guess XD